Abstract
Pressure ripples, which are inevitably generated by a fluctuation of flow rate caused by a pump mechanism, bring out noises and vibrations in hydraulic pipeline, so that these deteriorate the stability and accuracy of the hydraulic systems. Accumulator and hydraulic attenuator are normally used to reduce the pressure ripples. In this study, a parallel line is introduced to the hydraulic pipeline for the hydraulic system with an axial piston pump of bent axis as the method to reduce the pressure ripples. The dynamic characteristics of the hydraulic pipeline with a parallel line are analyzed by transfer matrix in frequency domain. The usefulness of the hydraulic pipeline with a parallel line is ascertained by an experiment and simulation. The results from the experiment and simulation show that the hydraulic pipeline with a parallel line can reduce the pressure ripples well.